package com.moon.interface_api.utils;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.DisposableBean;
import org.springframework.context.ApplicationContext;
import org.springframework.context.ApplicationContextAware;
import org.springframework.context.annotation.Lazy;
import org.springframework.stereotype.Service;

import java.util.Arrays;
import java.util.List;

/**
 * Created by chengliang on 2019/5/15.
 * @Description: Spring工具类
 * 以静态变量保存Spring ApplicationContext, 可在任何代码任何地方任何时候中取出ApplicaitonContext.
 */
@Service
@Lazy(false)
public class SpringUtils implements ApplicationContextAware, DisposableBean {

    private static ApplicationContext applicationContext = null;

    private static Logger logger = LoggerFactory.getLogger(SpringUtils.class);

    /**
     * 实现ApplicationContextAware接口, 注入Context到静态变量中.
     */
    public void setApplicationContext(ApplicationContext applicationContext) {
        logger.debug("注入ApplicationContext到SpringContextHolder:" + applicationContext);

        if (SpringUtils.applicationContext != null) {
            logger.warn("SpringContextHolder中的ApplicationContext被覆盖, 原有ApplicationContext为:"
                    + SpringUtils.applicationContext);
        }

        SpringUtils.applicationContext = applicationContext; //NOSONAR
        System.out.println(applicationContext);
    }

    /**
     * 实现DisposableBean接口,在Context关闭时清理静态变量.
     */
    @Override
    public void destroy() throws Exception {
        SpringUtils.clear();
    }

    /**
     * 取得存储在静态变量中的ApplicationContext.
     */
    public static ApplicationContext getApplicationContext() {
        assertContextInjected();
        return applicationContext;
    }

    /**
     * 从静态变量applicationContext中取得Bean, 自动转型为所赋值对象的类型.
     */
    @SuppressWarnings("unchecked")
    public static <T> T getBean(String name) {
        assertContextInjected();
        return (T) applicationContext.getBean(name);
    }

    /**
     * 从静态变量applicationContext中取得Bean, 自动转型为所赋值对象的类型.
     */
    public static <T> T getBean(Class<T> requiredType) {
        assertContextInjected();
        return applicationContext.getBean(requiredType);
    }

    /**
     * 清除SpringContextHolder中的ApplicationContext为Null.
     */
    public static void clear() {
        logger.debug("清除SpringContextHolder中的ApplicationContext:" + applicationContext);
        applicationContext = null;
    }

    /**
     * 获取当前profiles
     */
    public static List<String> getActiveProfiles() {
        assertContextInjected();
        String[] activeProfiles = getApplicationContext().getEnvironment().getActiveProfiles();
        return Arrays.asList(activeProfiles);
    }

    /**
     * 获取配置文件数据
     */
    public static String getProperty(String key) {
        assertContextInjected();
        return getApplicationContext().getEnvironment().getProperty(key);
    }

    /**
     * 获取配置文件数据
     *
     * @param key
     * @param defaultValue 默认值
     * @return
     */
    public static String getProperty(String key, String defaultValue) {
        assertContextInjected();
        return getApplicationContext().getEnvironment().getProperty(key, defaultValue);
    }

    /**
     * 检查ApplicationContext不为空.
     */
    protected static void assertContextInjected() {
        if (applicationContext == null) {
            throw new IllegalStateException("applicaitonContext未注入,请在applicationContext.xml中定义SpringContextHolder");
        }
    }
}
